<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
		<script>
			var year=parseInt(prompt("请输入一个年份"));
			if((year%4==0&&year%100!=0)||(year%400==0)){
				alert("您输入的年份是闰年");
			}else{
				alert("您输入的不是闰年");
			}
		</script>
	</body>
</html>
